籼粳杂交稻枝梗和颖花形成的播期效应

doi:10.3864/j.issn.0578-1752.2015.07.05

Abstract

Abstract: 【Objective】The objective of the study is to elucidate the effects of sowing date on characteristics of spikelets formation of hybrid rice with different compositions of indica and japanica.【Method】The inbred and hybrid varieties with different compositions of indica and japanica, Yongyou8 and Yongyou15, Qianyou2 and Zhejing88 were used in this study. The characteristics of differentiation and degradation of branches and spikelets were investigated, and the relationship between the composition of indica & japonica and the character of rice panicle was analyzed.【Result】The total number of differentiated spikelets per panicle of hybrid rice Yongyou 8 and Yongyou15 with indica-japonca blood were significantly higher than the indica rice Qianyou2 and japonica rice Zhejing88. The numbers of differentiated primary branches and spikelets on primary branches of Yongyou 8 and Yongyou15 were also significantly higher than the indica and japonica rice. The number of secondary branches, and spikelets on secondary branches of Yongyou15 and Qianyou2 was more than two others rice varieties. The number of differentiated spikelets decreased significantly with the sowing date delaying (ie. 28, June), especially the number of differentiated spikelets on secondary branches, but differentiated spikelets on primary branches on suitable sowing date (ie. 21, June) was more than other sowing date. More number of differentiated spikelets of Yongyou8 and Qianyou2 was found when the sowing date was ahead (ie.14, June). Degradation spikelets on primary branches of Yongyou varieties decreased significantly at suitable sowing date, and low spikelets degradation was observed for Yongyou8 in the middle-upper part of panicle and the base part or top part for Yongyou15, respectively, and that caused by higher primary branches differentiation. In all sowing date treatments, the number of differentiated secondary branches decreased from base panicle to top panicle in all varieties, and the secondary branches, spikelets on secondary branches showed an increased and then decreased tendency. The advantage was that low degradation of secondary branches, spikelets on secondary branches in the middle-top of panicle of Yongyou8 when the sowing date was ahead, and that was the base-middle of panicle for Qianyou2. The low degradation of spikelets was found in the top of panicle of Yongyou15 at suitable sowing date, and the advantage of sowing date delaying was that low degradation of spikelets happened in the base of panicle of Zhejing88. There was a significantly parabolic correlation between the japonica consanguinity component and the number of differentiated spikelets, primary, secondary branches and its spikelets, and the correlation coefficient was 0.8172, 0.9416, 0.9004, 0.8718 and 0.7988, respectively.【Conclusion】There were more branches and spikelets of indica-japonica hybrid rice than indica and japonica rice. Differentiated spikelets and secondary branches per panicle were reduced significantly with sowing date delaying, and it promoted the formation of spikelets and secondary branches when the sowing date was ahead for medium-maturing varieties, while there was a positive effect for late-maturing varieties by selecting suitable sowing date. There was a significantly correlation between the japonica consanguinity component and the branches, spikelets of panicle in all sowing date treatments.

Key words: indica-japonica hybrid rice, sowing date, branches, spikelets, composition of indica and japanica

ZENG Yan-hua, ZHANG Yu-ping, WANG Ya-liang, XIANG Jing, CHEN Hui-zhe, ZHU De-feng. Effects of Sowing Date on Formation of Branches and Spikelets in Indica-Japonica Hybrid Rice[J].Scientia Agricultura Sinica, 2015, 48(7): 1300-1310.

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